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Registered
Join Date: Jan 2003
Location: Burford, ON, Canada
Posts: 2,336
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This is a known problem with S calipers. I always replace the pistons. Consider those from PMB Performance:
48mm Stainless Steel S-Caliper Piston
or as you noted
DuroAno S-Caliper Pistons
Either are great solutions.
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Keeper of 356, 911, 912 & 914 databases; source for Kardex and CoA-type reports; email for info
Researching 356, 911, 912 & 914 Paint codes, Engine #'s and Transmission #'s
Addicted since 1975
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